Why do marketing researchers use objective, rather than subjective, measures of social class?

The objective method of computing social class is often favored to the subjective and reputational methods. The objective approach is founded on consumers ‘reactions to one or more truthful questions about socio-economic items (e.g. job, revenue, education) that can be simply encompassed in most self-administered marketing research questionnaires. These aspects deliver a good competition to consumers’ routine, contestable income and interests.

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.